error[E0277]: the trait bound `&Baz: Happy` is not satisfied --> $DIR/multiple-0.rs:34:9 | LL | foo(&baz); | --- ^^^^ the trait `Happy` is not implemented for `&Baz` | | | required by a bound introduced by this call | note: required by a bound in `foo` --> $DIR/multiple-0.rs:30:26 | LL | fn foo(_: T) where T: Happy {} | ^^^^^ required by this bound in `foo` help: consider dereferencing here | LL | foo(&***baz); | +++ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0277`.